function [ status, buff] = mx_eyelink_read_reply( )
%MX_EYELINK_READ_REPLY Returns text with reply to last read request.
%
% Parameters:
% Returns:
% OK_RESULT (0) if response received.
% NO_REPLY (1000) if no response yet.
% buf 	String to contain text.
%
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% Copyright Eduardo Aponte 2013
% aponteeduardo@gmail.com